Also known as the Lady of Stone, Euryale was a medusa that was the warlord of Grelick Cove, in the service of the Daughters of Sora Kell. She asked Arc, Elias Minch, Daellin and Smith to investigate the Emerald Claw that were operating out of a nearby haunted wood.
She spent much of her time in her garden at the top of the cliff that Grelick Cove was built into; the garden contained many people that she had petrified over the years. Most seemed to be enemies, but there also seemed to be some of her own people that were turned to stone in a moment of prayer.
She did not wear a blindfold as some of her brethen do when they encounter people from the Five Nations; instead, she simply averted her gaze. This let the people that she was talking to know that she was in full control of the conversation, as a glance upwards would be all it would take.